﻿NEOTROPICAL 
  MALLOPHAGA 
  — 
  CARRIKER 
  535 
  

  

  Key 
  to 
  the 
  species 
  of 
  Dennyus 
  

  

  (Data 
  are 
  insufficient 
  for 
  the 
  inclusion 
  of 
  cypsiurus 
  Thompson, 
  francicus 
  Thomp- 
  

   son, 
  and 
  hirundinidis 
  (Linnaeus).) 
  

   la. 
  Head 
  very 
  short 
  and 
  wide; 
  prothorax 
  quadrilateral, 
  without 
  lateral 
  lobes; 
  

   mesothorax 
  and 
  metathorax 
  very 
  short 
  and 
  very 
  wide 
  (more 
  than 
  3 
  times 
  

  

  wider 
  than 
  long) 
  ; 
  abdomen 
  oval 
  brevicapitis, 
  new 
  species 
  

  

  16. 
  Head 
  but 
  little 
  wider 
  than 
  long. 
  

  

  2a. 
  Pre-antennary 
  portion 
  of 
  head 
  with 
  sides 
  almost 
  parallel 
  and 
  front 
  trans- 
  

   verse 
  (head, 
  .49 
  by 
  .51); 
  temples 
  more 
  or 
  less 
  angular, 
  .distinctus 
  Ferris 
  

   26. 
  Pre-antennary 
  area 
  circular; 
  temples 
  small, 
  narrow 
  and 
  rounded, 
  but 
  little 
  

  

  expanded 
  (head, 
  .47 
  by 
  .59) 
  minor 
  (Kellogg) 
  

  

  Ic. 
  Head, 
  thorax, 
  and 
  abdomen 
  of 
  shape 
  normally 
  found 
  in 
  the 
  genus. 
  

  

  3o. 
  Fringe 
  of 
  setae 
  along 
  anterior 
  edge 
  of 
  temples 
  double, 
  one 
  pointing 
  out- 
  

   ward, 
  the 
  other 
  backward; 
  double 
  rows 
  of 
  long 
  hairs 
  on 
  posterior 
  

   margins 
  of 
  temples, 
  occiput, 
  prothorax, 
  and 
  metathorax; 
  patches 
  of 
  4 
  

   to 
  6 
  exceedingly 
  long 
  hairs 
  in 
  median 
  portion 
  at 
  each 
  side 
  of 
  tergites 
  

  

  II 
  to 
  VII 
  (nearly 
  as 
  long 
  as 
  abdomen) 
  intonsus, 
  new 
  species 
  

  

  36. 
  Chaetotaxy 
  normal, 
  not 
  as 
  above. 
  

  

  4a. 
  Posterolateral 
  margins 
  of 
  temples 
  clearly 
  convex 
  from 
  lateral 
  to 
  poste- 
  

   rior 
  angle, 
  not 
  straight 
  or 
  concave. 
  

   5o. 
  Abdominal 
  segment 
  VIII 
  in 
  both 
  sexes 
  deeply 
  concave 
  on 
  poste- 
  

   rior 
  margin, 
  with 
  all 
  (cf 
  ) 
  or 
  most 
  ( 
  9 
  ) 
  of 
  segment 
  IX 
  within 
  this 
  

   concavity; 
  Male 
  genitalia 
  very 
  dififerent 
  from 
  all 
  other 
  species 
  

  

  of 
  the 
  genus 
  major 
  (Uchida) 
  

  

  56. 
  Abdominal 
  segments 
  VIII 
  and 
  IX 
  normal, 
  not 
  as 
  in 
  5a. 
  

  

  6a. 
  Numerous 
  peglike 
  spines 
  on 
  dorsal 
  surface 
  of 
  head 
  and 
  prothorax. 
  

  

  spiniger 
  Ewing 
  

   66. 
  No 
  peglike 
  spines 
  on 
  head 
  or 
  thorax. 
  

  

  7o. 
  Prosternal 
  plate 
  with 
  numerous 
  short, 
  thickened 
  spines 
  (10 
  to 
  12), 
  

   with 
  or 
  without 
  longer 
  setae. 
  

   8a. 
  Pre-antennary 
  margin 
  of 
  head 
  uniformly 
  rounded 
  and 
  poste- 
  

   rior 
  margin 
  of 
  temples 
  strongly 
  convex; 
  10 
  short 
  spines 
  on 
  

   prosternal 
  plate, 
  without 
  any 
  longer 
  setae. 
  

  

  rotundocapitis, 
  new 
  species 
  

  

  86. 
  Pre-antennary 
  margin 
  of 
  head 
  not 
  tmiformly 
  rounded, 
  but 
  with 
  

  

  sides 
  slightly 
  concave. 
  

  

  9a. 
  Twelve 
  short, 
  straight 
  spines 
  and 
  2 
  long 
  setae 
  on 
  prosternal 
  

  

  plate; 
  plate 
  with 
  straight 
  sides 
  converging 
  sharply 
  

  

  posteriorly; 
  temples 
  strongly 
  convex 
  posteriorly. 
  

  

  brunaeitorques, 
  new 
  species 
  

   96. 
  Twelve 
  short, 
  curving 
  spines 
  on 
  central 
  area 
  of 
  prosternal 
  plate, 
  

   and 
  a 
  long, 
  curving 
  seta 
  at 
  anterior 
  angle 
  of 
  same 
  area; 
  

   plate 
  with 
  sides 
  subparallel 
  and 
  concave. 
  . 
  richmondi 
  Ewing 
  

   76. 
  Prosternal 
  plate 
  with 
  3 
  to 
  6 
  longish 
  setae 
  on 
  anterior 
  portion. 
  

   10a. 
  Prosternal 
  plate 
  long, 
  and 
  narrow 
  posteriorly, 
  with 
  narrow 
  

   lateral 
  bands, 
  and 
  with 
  5 
  (or 
  6) 
  longish 
  setae; 
  temples 
  

   strongly 
  rounded 
  and 
  pre-antennary 
  margin 
  uniformly 
  

   circular. 
  

   11a. 
  Setae 
  along 
  posterior 
  margin 
  of 
  abdominal 
  tergites 
  consist 
  

   of 
  short, 
  thickened 
  hairs, 
  alternating 
  with 
  hairs 
  nearly 
  

   length 
  of 
  segments; 
  sides 
  of 
  thorax 
  straight. 
  

  

  similis, 
  new 
  species 
  

  

  